you can participate on the cheap but it's very difficult to BE cheap to participate. Low priced gear WITH free shipping? You're kindof asking for the world to be served to you on a silver platter with that request.
Some places have free shipping if you order over an X$ amount, but if you're being cheap, you likely won't be buying enough to make the minimum $ amount to qualify for a free shipping promotion.
Now if you're trying to play ON the cheap, then the smart bet would be to look for surplussed us military stuff that can be had for pretty cheap, provided you don't mind older styled things or items with well loved/used qualities, but you still have to pay for shipping. Gas to power delivery vehicles is not free, nor is the time of those people working for those companies that move goods.
I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.