There is pretty much ProLab and then all of the others... in terms of quality.
There are literally dozens of mail order ones available, though. Just go to any APMA meeting 😛
Orthotics have a role, but they are such a customer service nightmare that it is often best to just Rx them out (best info possible on Rx regarding the foot pathology, accomod vs functional, etc) if you have good custom DME places nearby. Those places will respect you and send you surgical stuff that is failing insoles/shoes/brace in return. It is not worth trying to save a few bucks with Value-Thotics or pushing custom orthotics and dealing with the many orthotics customer service issues that may follow, jmo. You will lose patients. If you do too much grinding of heel posts and fiddling with sweet spots, you will have to apply for a vanity license plate with TFP on it.
...So yeah, I do pre-fabs (PowerStep, Spenco, PureStride, soft DM prefab insoles, etc type), add a pad if useful, let pts go buy those from running or sports store (accomodative at drug store), etc for the majority. The research for custom orthotics being superior to prefab for most fairly regular foot types and common deformities is conflicting at best... hence very few payers covering customs.
Second choice, in my hands, is give written Rx for custom orthotics out for ortho store for tougher situations (cavus, advanced flatfoot, big deformity, prior surgery, amp/filler, AFOs, etc).
Third choice is that I make a custom cast for someone who did good with prefabs but wants something more durable (basic arch/heel, metatarsalgia, etc). That can still backfire for even the easiest plantar fasciitis patients... expectations are often just way too high for the $300 $400 $500 etc... buyer remorse, not quite perfect, etc. I side step that whenever reasonably possible.
Another thing worth mentioning is that it is nice to re-cover or re-surface orthotic shells people have and like. So yeah, any DPM needs a lab or good place to send them. That re-surfacing's almost a slam dunk to work well and be cost-effective, so every DPM office should have a lab that does that service well.
Like the nail care, I just don't think custom DME in-office is a huge part of any modern podiatry practice. There are rare exceptions of DPM practices employing an orthotist with a mini-lab, but those are fading away. And frankly, a real dedicated custom shop with good orthotist(s) is going to be better than nearly any DPM nowadays... this isn't CCPM in the 1970s anymore (but you can re-cover those shells). 🙂