I personally don't recommend getting medication online but will always help anyone who chooses to do so.
Clomid does raise odds of twins 8-10%. I absolutely agree that twins sound cute but the data and our experiences indicate they do make for a much higher risk pregnancy and a lot of our twin stories do not have the happiest endings unfortunately. Femara is said to cause less twinning but to be totally honest I am not convinced that this is based on any actual data or just one of those things that doctors believe to be the case. So I'd be wary of either, but then again you can get twins anyway and most of the people who conceive on the meds end up having singletons.