Did you keep your Verizon devices when you moved over?
I am not cshaw, but I can (and have) answered this question already earlier on and in the guide. The answer is no. You cannot activate Verizon handsets with Sprint MVNOs, nor can you activate Sprint handsets with Verizon MVNOs. You can, however, take your Verizon iPhones over to a GSM MVNO. Ting's Sprint service can only activate Sprint handsets, and Ting's T-Mobile with roaming coverage - though you can use your iPhones with - is not going to be anything remotely close to their Sprint with roaming coverage in your area. Ting's Sprint coverage roams on Verizon, US Cellular, and a few other regional providers. Ting's T-Mobile coverage only roams on other regional GSM providers with no AT&T roaming support, and Idaho has no other GSM providers except for T-Mobile and AT&T, IIRC. Lastly, Ting's not even remotely a great deal on the GSM end, especially on the T-Mobile MVNO end. Their strong suit is multi-line accounts and CDMA service.
If AT&T coverage is solid in your area (and it will likely be more so than T-Mobile) and you got your data usage under control (under 400MB combined - easily done), you could keep your current Verizon iPhones and go with Puretalk USA where you could get away with not needing to spend more than $25-35/month total using their family plan, especially if most of your texts are between each other and you offload from traditional SMS to data with iMessage or whatnot. Even if you bumped yourselves up to 1GB of shared data, it still wouldn't break $45, and at that price range, you could even do two simple plans with 250 minutes and 400MB of data each line and only come in at $40/month. There's also Consumer Cellular as an option in that $35+ range that will work with even less data sacrifices (though there will be taxes on top like Ting charges) and you won't have AT&T MVNO/iPhone data configuration issues that you might elsewhere, plus you'll get both AT&T native and T-Mobile roaming network coverage.
You go beyond these options, you're either looking at needing to spend in excess of $60/month and still need to go on a data diet to get below 500MB of data usage per line a month to keep your current handsets with a Verizon MVNO that will frankly have terrible customer support, or you'll have to lose money, go through the hassle of, and contribute to even more electronic waste in the end by selling off your current handsets and buying replacements compatible with the Sprint network which you'll then be locked into but still might have activation problems with due to
Sprint's recent FED activation screw-up.
There's a reason why I keep the guide, I know what's going on in the market and with the MVNOs. Take my advice: keep your handsets, go on a data diet, and go with an AT&T MVNO from the guide once you confirm AT&T coverage in your area is solid. You should
easily be able to get in well below this price point with some data belt tightening (the cheapest you'd be able to get going with an AT&T MVNO for your talk and text needs being $20/month total with Airvoice using their $10 plans if you gut your data below 50MB each handset), but if you spend more than $55/month total after taxes, you're paying too much.