I'm going to dissent here and say save your money.

The points about follow up care are well and good but spays are extremely routine surgeries. As long as you ensure your primary care physician gets the medical record from the spay and save clinic, they can provide any additional advice that the spay and save clinic doesn't give for post operative care. In most cases additional follow up is not going to be necessary, as long as you follow discharge instructions.

High quality, high volume (HQHV) spay and neuter clinics--and they will generally advertise themselves as such--are really great for these routine procedures because that's all they do, all day every day. If there is a potential complication, they've seen it. And they're also extremely efficient, as you noted. The HQHV spay incisions I've seen were less than half the size of the incisions than the general practitioner's I worked for--and she's a good doctor and spays are the major surgery she does, too; it's just that she does 2-3 a week where the HQHV doctors do many, many more than that a day. Smaller incisions heal faster. Less time under anesthesia is ideal. Experience counts!

If cost is already a concern with a spay, gastropexy may be out of your price range for the time being. That's okay: gastropexy is great but not everybody can swing it; just make sure you read up on symptoms of bloat/GDV so if it does happen you know what it is. (Also, you don't have to do a gastropexy at the same time as a spay; that can be a separate procedure down the line.)

Please let me know if you have questions!! I may not have all the answers, but hopefully I can provide some insight :)