Hi @LA_GENT1
In addition to the apps mentioned by @Victor_5 , you can also take a look at PH MultiCarrier Shipping Label App. The app integrates with top shipping carriers in UK: Parcelfore Worldwide, EasyPost, UPS.
Since you are looking for an economical option, UPS’s competitive shipping rates with discounts of up to 75% will be an ideal option. This offer is specially available for the European merchants. You can check out the details here!
Let me know if you have any queries. I will be happy to help!