KCNDreams You can use the EA Wallet funds with any purchase through the EA App, including SimPoints. (That's how I've bought points every time.) I think you can only combine EA Wallet funds with a credit card though, not PayPal.
MMAO can be great but only rarely. For me, the problem has been that it usually includes at least one full set, at its full price, which makes the deal worse than if I used the Daily Deal and other strategies to buy all the items separately. But I do occasionally see a MMAO option with only single items, that aren't on sale, for enough of a discount that makes it worth purchasing. It just takes time and luck.
I also bought a few worlds through MMAO for ~30% off, factoring in paying full price for the other items offered with the world. That doesn't help when you only have 990 points, but if you do buy more and want a world or two, it's a viable strategy to avoid paying, say, 3,500 points for Midnight Hollow Gold.