If you're making more than a few thousand of a product (preferably more than a few 10's of thousands) then the manufacturers will engage with you and you will be able to select from hundreds of different options. If you're not, then you're basically limited to whatever digikey (et al) has, which is still a reasonable collection.
Probably any of these will work for you. If you actually are going to make a lot of something, you can choose one and then when you need a lot, just talk to a distributor (probably not digikey).
For example, I see that arrow has 82,000 of the CC3100R11MRGCR ready to deliver to you. If you need more than that, you would talk to TI directly and make an order from their factory. Their lead time is probably something like 10-15 weeks.
Supply chain for manufacturing is a whole team of people in most hardware companies, because getting large quantities of stuff from all over the world to be in one place at the right time is difficult. If you're just talking about being able to make 20 of your board, it's best to stick with digikey.
Edit: I should also point out that these are wifi MCU's, not wifi modules, and so you will have to add your own antenna and do your own certification etc. You may want to stick with this list, but some of these will be WIFI transceivers only, some will have a programmable microcontroller in them. Its up to you which kind you want.