Looking for a good tank source

I was about to help you until you said "affordable" ... LOL

I know that here in Dallas I rented a 6000 psi nitrogen tank for about $200 a year. Then had them come fill it when it got down to 3000 psi. Can't exactly remember the refill cost but it was maybe $150. And that much air lasted 8 months or so. But, you need an expensive regulator for the bottle. So it is about the same as buying a tank anyway. If you don't know where to look, check out airtanksforsale.com Joe Brancato is a great guy and his stuff is top notch. His merchandise isn't cheap but it is because it is the really good stuff.

Crusher
 
Midway USA has the Benjamin 90 CI Carbon Fiber for $279 or $249 after a Crosman $30 rebate. It's on back ordered right now but you can still order one if you don't mind waiting. Jet has it for $355 or $325 after Rebate. Cabela's has it on sale for $319 or $289 after Rebate. You can also order it directly from Crosman for $322.49 with Code AGNATION and then mail in the rebate form to save an additional $30. Hope the info helps.Here are the links

Midway USA
https://www.midwayusa.com/product/437407/benjamin-pcp-charging-system-90-cubic-inch-carbon-fiber

Cabela's
http://www.cabelas.com/product/BENJAMIN-PCP-CHARGING-SYSTEM/2030882.uts?slotId=0

Crosman
http://www.crosman.com/pcp-charging-system-15

Jet
https://jet.com/product/Crosman-Benjamin-90-Cubic-Inch-Charging-System-Cylinder-81001/7356068adf54493d9c441a5841942e8f
 
I assume you have a fill station nearby!
Its not only the tank, its the the gas station.
​I am buddies with the volunteer fire department. they give me their obsolete bottles (carbon fiber) they may be nearly expired and instead of paying to get the hydro tested. they get the latest and greatest new bottles. I have an AV compressor. 1 omega 78(?) and 10 fire house bottles. trying to get a club started. finding people who can afford PCP is a little tough in the this part of the country.