REI allows electronics to be returned within 90 days, box opened and used, no questions asked.
I bought a $500 Garmin last year and used it for a month. Battery life was dismal, four hours. I brought it back for a full refund on the spot.
I'm going to try a Wahoo Roam and will purchase it from REI. If I don't like it after a month or two, back it will go. I'm not able to find the Roam on Amazon but if they had it I'd consider it.
If you want the lowest everyday street price then buy from Sigma Sports in England. The 830 is $362. The Bolt is $207. Some products like the 1030 and Roam don't ship to the US though.
REI sometimes has $100 off Garmin products as well.
Back on topic, a SPOT device is something I've been thinking about. Thanks Forrest.