I use a 36lb Digiweigh scale and it works very well. Unfortunately none seem to be listed on eBay at the moment. But there are some under completed listings. If one pops up on eBay it might be worth considering. The scales that support more than 36lbs seem to not be as accurate (accurate to every .2 ounces instead of .1 like the 36lb or less scales).
It looks like most other brands are 35lb not 36lb. I can't speak about accuracy of other scales, but I'd guess most of them would be fine. I'd look for a 35lb scale that looks good and is accurate to .1 oz.