The Mustang and Tacoma take standard Oil Filters, I'm not sure what the wife's Subaru takes...it has free oil changes for another year so the dealer takes care of it. I do know what you are talking about though. I actually just bought a case of Toyota Oil filters through Amazon for 50 bucks...Toyota OEM.
As far as the Zero weight oil, I usually buy it by the case. I bought two cases of Kendall 0w-20 through Petroleum Service Company online, so I am still whittling away on that. I'm going to be due for another case or two soon, so I'll either get the Kendall, or watch for a sale on Toyota oil at the local dealer. It's usually about 90 bucks a case for the Toyota oil.
I use Ford Motorcraft Syn-Blend in the Mustang, it's 5 weight and not that pricey...
Walmart Supertech 0w-20 is about 5 bucks a quart, I priced it over the weekend. If you are looking to save a few dollars. I'm sure it's just fine.
