There are several budget-friendly paid VPN apps available in the market. Here are some options you can consider:

1. NordVPN: NordVPN is a popular VPN service that offers excellent security and privacy features at an affordable price. Their plans start at $3.71 per month, and they offer a 30-day money-back guarantee.
2. Surfshark: Surfshark is a fast and reliable VPN service that is also very affordable. Their plans start at $2.49 per month, and they offer a 30-day money-back guarantee.
3. Private Internet Access: Private Internet Access (PIA) is another popular VPN service that is known for its strong security features. Their plans start at $2.59 per month, and they offer a 30-day money-back guarantee.
4. CyberGhost: CyberGhost is a user-friendly VPN service that offers fast connection speeds and strong security features. Their plans start at $2.25 per month, and they offer a 45-day money-back guarantee.
5. ExpressVPN: ExpressVPN is a premium VPN service that offers excellent security and privacy features. While it is not as budget-friendly as some of the other options on this list, their plans start at $6.67 per month, and they offer a 30-day money-back guarantee.

When choosing a budget-friendly VPN app, it is important to consider factors such as security, privacy, speed, and ease of use. It is also a good idea to look for VPNs that offer a money-back guarantee so that you can try out the service before committing to a long-term subscription.