I agree about trying sandals, but if you want shoes, this is from a post I made in another thread:

You may want to look at some of the $40-ish options on Amazon. Someone else mention Saguaro; I have some Whitins (these are like VFFs without separated toes) that seem like they'll perform very well for the price, and there are other options like TSLA (Vapor Glove knockoffs). There are other vaguely VFF-looking options that are cheap, such as Oranginer, Seekway, and Weweya.