Need recommendations for low-end phones other than Grandstream

I run a PBX as a pro-bono project for a state division of a national public-service non-profit. We have a few dozen Grandstream phones, mostly GXP1400, and need a few dozen more.

I am having a support issue with Grandstream and am looking for alternatives for our next major purchase.

Can any of you suggest an alternative for single- and two-line phones at about the same price point? Being a non-profit that exists largely on donations, we need to keep costs as low as we can.

Thanks…

RCA by Telefield, They have the IP110 two line phone available for under $50 a handset.

They support HTTP and TFTP provisioning and do wide band audio.

No BLF.

Or Yealink. Cheap and good support, also has a VPN client.