Please don't take this wrong but if you can't afford a hangar or at least a shared space in a hangar then you may not be able to afford the airplane. The money for a hangar in most cases anyway is the least expensive part but that being said it may not be cheap in your area that's why I suggested a shared space.
You are right to look at Tri gears if you are not endorsed for a conventional gear. There are many options out there in the experimental category that meet your needs. My aircraft is extremely cheap to operate and own. It also has some very good performance for the horsepower. However it is not what I would call short field capable. I do not fly into anything under 2500 feet with any kind of obstacles on each end.
There are many experimental aircraft out there in the two seat category with varying performance that you can get for under 30 and many under 20k that is.
Set the parameters for the type of performance you would like, and I mean realistic performance because we are all dreamers LOL then go from there. There are many people on here that will share their experiences with different types of airplanes and the true cost of ownership with them. The hard part is deciding which one.
Here in southern California hangars are an enormous expense. Cheapest ones within 50 miles are about $400/month, the ones at the airport down the street from me start at about $900/month. I can get a tie down about 25 miles away for $54. There's no other expense in owning a small 2 seat LSA/EAB (insurance, annual reserve, overhaul/maintenance reserve, etc) that costs more that $400/month...except maybe buying more than 15 hours worth of fuel for said LSA in a month
What kind of plane do you own? You said it was extremely cheap to own and operate...
We're moving into Affordaplane territory
Which I would totally consider if I didn't have two boys that are dying to go flying with me I'm really liking the John Croke videos of his Affordaplane build, btw...
I have had offers to sell my plane and it is for sale but the OP said "cheap" so I don't think mine qualifies. OK so it's not for sale but if you really want to buy it just keep on peeling off those FRNs with Franklin's photo on them and I'll let you know when to stop ...
Dale I've been envious of your plane for some time...if it really is for sale let me know. Big fan of the Sonex/Corvair combo