[Qrawl]

My advice is: Deposit enough for 100 of the lowest SNG buyins. Just play single table SNGs. Then move up to the next level with anything greater than the 100 buyins.

Example: Deposit $110. This covers 100 $1.10 SNG buyins. Play until you have 112.20. You can now enter 1 $2.20 SNG. If you stay above $110, keep playing the $2.20s until you reach $220, then move up. Rinse and repeat.
If you fall below $220, you must play 2.20s. Likewise, if you fall below $110, you must play 1.10s.

Also, make a spreadsheet to keep track of 100 SNGs. Let's say you play 100 1.10s. You're instantly $110 in the hole when you begin the 100 SNG session. Make the spreadsheet so it automatically keeps a running total. You can see when you break even, and go into profit, etc.