Some people say buying a pre-made strop is a waste of money, and that is probably correct if you have the materials lying around and have an aptitude for making stuff like strops. I did not have the materials, and I don't have the aptitude for making stuff like that. So all of my strops are bought.
Hands down, my favorite strop by far is the Knives Plus Strop Block. It used to cost $19. I see that it goes for about $23 now, and it is worth every penny of that. I recommend the Strop Block not only because you said you are looking for a strop, but also because you said that you are worried about the stropping compound. The Strop Block is a very unique construction, and I don't think I've seen anyone else make their strops the same way as this one. The folks at Knives Plus take green compound and melt it down with olive oil and then hot work that mixture into chap leather hot-glued to particle board. Then they re-raise the nap with a razor. Once your strop starts loading up, you just wet your finger tips with olive oil and rub new compound to the surface. I've had mine for years now and have never had to reload it and never had to clean or scrape it. I've got many other strops from CKTG, Bark River, etc. in horsehide, kangaroohide, cowhide, etc. Magnet-backed, wood-backed, glass-backed... you name it, I've got it. I've got one that is 12" long, and I've got a few that are pocket-sized. Some I've used bare (mainly the kangaroohide glass-backed from CKTG), some I've loaded with black compound, green compound, diamond paste, diamond spray... even Heavy Handed's handmade stuff!
The Knives Plus Strop Block is my favorite. It is a very thoughtfully made, high-quality piece of kit. The only time I wouldn't use it is if I was using my plain 'roohide strop as a finishing step. Otherwise, it's the only strop I think I'll ever need, and I assume it will last many more years without having to reload or clean it in any way.