[partiallogic]

Can you recommend any dslr models or what to look out for when buying used with the intention of only using it as a webcam?

[murkt]

You actually want a mirrorless camera, not a DSLR one. If you intend to only use it as a webcam, probably just buy Panasonic G7 or Canon M200 for $500.

[piranha]

Canon M200, Panasonic G7, Sony a5100 (oldest but can be bought for cheap and has good autofocus).