Do any affiliates provide quality bonuses? not just 100s of old plr ebooks.

Some affiliates are offering these bonuses just for the sake of giving a bonus... Which isn't cool.
If the eBook is relevant and helpful, I don't see a problem with that.
What is even better is giving away your own product as a bonus but this is an option for products creators only.
Art

I certainly don't.

I build my affiliate business on the basis of people choosing to buy through my affiliate link because I'm the person making the recommendation, and I've build up a trust-based relationship with them which gives them such confidence that they'll quickly and easily buy, that way, preferably without even paying too much attention to the vendor's sales page.

I don't want them buying through my link because I'm giving them something extra. To me, that would feel almost like "competing on price". It feels like a way of saying "Buy from me: I'll give you more".

I don't suggest there's anything intrinsically wrong with that, of course. Nor do I suggest that it doesn't ever work. It just isn't the kind of business I'd want to build, myself. In the long run, in affiliate marketing, a lot of my income comes from making repeated sales to the same people (without having to give anything "extra"), and I do that by relationship-building (through automated emails) with my subscribers.

I know that many of my subscribers are (and/or "have been") on other marketers' lists too, of course. It's naive to imagine that isn't so. In those cases, I make my living by becoming the person through whose link the customer chooses to buy because they trust me and want me to have the commission (and I tell them very openly about commissions and reassure them that they come out of the vendor's cut rather than out of the customer's pocket, and I tell them - by example - what I spend that money on), not because I'm offering them additional bonuses that other affiliates aren't offering.

I also think that "needing to offer bonuses" can detract from and reduce the perceived value of of the main product.

I also know (from other people's split-testing results I've seen) that giving additional bonuses can increase the product's refund-rate.

From ClickBank alone, I now promote over 40 different products in 9 entirely different niches, to tens of thousands of subscribers, and it would rapidly become unmanageable for me to be offering all the potential buyers "bonuses".

My choice is firmly and clearly to avoid this scenario.

I also don't promote ClickBank offers, as an affiliate, if their sales pages have a large number of bonuses not very closely related to the product. I have five main reasons for this: first, I instinctively think they look ridiculous, detract from the offered product's credibility and come across as desperate; secondly, my subscribers tell me they think that, too; thirdly, long experience has taught me that they invariably convert worse with 7 diffuse bonuses than they would with one closely-related one; fourthly, they're going to have slightly higher refund-rates if sold like that; fifthly (and perhaps most important of the lot), I know that the vendors of those products haven't split-tested the effects of the important parts of their sales pages (if they had split-tested that, they would have abandoned it!), and of course that fills me with trepidation over what else might be wrong with their sales process that I haven't even noticed. Let's just say that I'd rather not be effectively going into business with them, and will always choose another vendor's product instead. (I suspect that their existence will surprise some people, who perhaps wouldn't imagine that "ClickBank vendors" would be such poor marketers as to do this, but I promise you there really are some products there which offer 7 or 8 different bonuses, many of them totally unrelated to the product! They're not exactly "bestsellers", needless to say. :p )

Ultimately, in my opinion, this whole issue of bonuses boils down - just like so many other internet marketing topics discussed here - to the difference in approach between the "fundamentally quantitative" and the "fundamentally qualitative".

There are certainly some affiliates that promote products using their own products that they create. I personally feel purchasing through these affiliates are people as they certainly would have put in effort to create their own products in the first place.