Wow, dodged a bullet there. Almost bought the TP-Link MR200 myself a few weeks back. I've worked first hand with Huawei's B535-232 and had pretty good transfer rates. Obviously YMMV depending on reception and a long list of other factors.
If you want to go cheaper, you could go for a USB modem like Huawei E3372; they work nicely after running usb_modeswitch
. They expose a network interface with default route. Clearly, this only makes sense if you intend to use your box as a firewall/router. Careful though - these already do NAT, do not support reverse NAT/port forwarding and therefore come with a box of limitations. Also, those USB modems usually don't even come close to the dual radio bandwidth rates that the Archer or B535 get to.
Sorry about going all Huawei on you. I'm certain there's a bunch of other manufacturers with equal products. Just didn't use them myself with FreeBSD, so can't make any recommendations based on experience.