aha, well then, just pee in your tank! cant get much cheaper, nor easy to get. lol, the last few cycles i have done were using the "outback special" method. no prizes for where that originated.
a hand full of "good" quality garden soil, plus a full bladder. its a time honoured method. apparently started, and still used, by Koi farmers in east Asia.
Honestly, if you are having trouble sourcing Ammonia, this is a safe, and sure way of fishless cycling.
most people have a few questions here, so.
1, its totally safe? your pee is sterile.
2, no it does not smell, no more than any other fishless cycle.
3, will it work? emphatically yes. perhaps no better than any other method. but just as well.
4, how do i check the amount of ammonia? same as any other cycle "water test kits". but you will need to keep an eye on the first few, ERR, doses. to check the amount of ammonia, each pee adds.
5, how long will it take? well, in my limited experience, 14 -18 days. but, as with any other cycle. times varied. (see 6)
6, what temperature? the higher, within reason, the better. 80-84f is where i, try, to aim. the higher the temp, the faster it will go.