If you're following a typical HRT protocol like Swale's, you'll be using about 100mg/week of Test Cyp and 250 to 500 iu/week of HCG.
A 10 mL (1000 mg) vial of DepoTestosterone can be had for about $100. That will last you 10 weeks.
A 10,000 iu vial of HCG costs about 50 bucks and will last you 8 weeks only because it expires after 60 days.
So, that's $10/week for Test and about $6/week for HCG.
You can beat these prices if you shop around, but conservatively, a reasonable HRT protocol will cost you $60/month if you don't have insurance. The price, of course, goes up if you need additional things like Nolvadex.
Sonny