Try Praktica, they are great cameras.
VLC model has removable penta-prism / right angle viewer , good for focusing. And it will be within your budget (you can be sure it is worth much more than that. I own one since '75, and I am still using it). Shutter mechanism is a bit heavy, there may be the vibration problem at short exposures
Praktica will accept all Pentax M42 lenses.
Edit:
Zenit cameras are also OK and within the budget, however possibly not as reliable as Prakticas
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