If you haven't already completed your certificates and ratings, you might consider dong them in a multi. You could get your ASEL private, then immediately get your AMEL private. After that, get your instrument rating in the multi, and then your commercial AMEL. Then, get the ASEL commercial add-on. If you're Part 61, you could build 100+ hours of multi just during your training.
It's more expensive, for sure, but just the marginal difference between the single and the multi rental rates--that is, you are trading single hours for multi hours. This is basically what you do with ATP, Ari Ben, and MAPD, but you could structure a similar program at your local FBO. When you're finished with your training, you'll be a lot more attractive as an MEI with all those multi hours.