Which services have you tried so far? Were they free or paid? What would you be able to budget for a vpn?
As far as a low cost VPN, my go-to is usually
Private Internet Access. They're definitely one of the cheapest I know of, and highly rated by many of the reviews I've seen (from
Torrent Freak, and
Best VPN, for example). There are definitely many others with a high quality VPN service (most of which I focus on anonymity and security), and most of them are relatively cheap. One that I used to use (when it was originally free) is
Froot VPN. They're definitely another low cost VPN solution, with a yearly subscription cost that comes to under $3 per month. Even when they were free, I never had a single problem with them; and I'm sure they are now a much higher quality VPN, as they originally had plans to expand into a much more stable operation. Oddly enough, my old account is still active with them, so I sent an email to see what's up.
If you have any particular needs from a VPN, I'd suggest checking out the reviews on from the links I posted, and contact the VPN providers directly; they will be able to help you out best.