Staples, and Office depot have some without....that's what I have. Bought at Staples. Check Best Buy also as they seem to have alot of stuff in stock. Places like Fred Meyer also carry some furniture.
when i was searching for a chair i went to office max and sat in one to find something comfortable. i found one that felt right and got it. what i didnt know is that chairs have hour ratings on them. some are 2+ hrs some say 8+hrs. after one week of having my chair(a low hr model) it got real uncomfortable. funny it felt right in the store. but trust me it matters.
also of the 3 chairs i got only one leans back. it lets me stretch in the chair which helps me stay comfortable and sit longer.
you need to look at how the chairs are put together before you buy one that your going to put together without arms .. all 3 of mine the arms are what hold up the back support(in a loop shape) and can not be put together without them.