My budget is super tight. Even with a supportive wife who loves going flying with me. We just don't have a lot of disposable income right now.
If I'm lucky I can scrape together $50 or so every couple of months - that usually goes towards servos, occasionally a new motor or RX. Propellers are my big expense - though I'm getting better at not crashing as often and flying more pusher setups so that's starting to get under control
I'm dying to try FPV but just can't swing the upfront costs. I have a small LCD screen and a decent CCD board cam from other projects...so it's really just a matter of getting a TX/RX combo. I've been considering a few low budget ways to do it but haven't managed to pull the trigger just yet.
And every now and then I can splurge a bit more and get something like my 9x or some new batteries. But my monthly average is pretty darn low.
I just checked and my total expenditures with HK are $532.22 with my first order in March of 2012. So 18 months ago...which averages out to just under $30 a month.
I've also ordered from a couple of other places ($100 or so on micro heli's, and probably another $150 on batteries and bits from other places when I didn't want to wait for overseas shipping or HK didn't have what I wanted.)
Factoring those in it comes to just over $40 a month. So it is possible to do it on a tight budget. But man I wish I could spend more on it!