Currently (as of July 16, 2009) you have these options to fund your MP3Sparks/allTunes account (if you're not a MemphisMember):

1. Get an AllPay pincode from forum member
phobozad using PayPal:
Allpay-EZ Pin Code Sales ($10, $15, $20)
The whole process from your request till you actually get the pincode from
phobozad usually takes minutes.
This pincode you can use to refill your allTunes balance (within a couple of more minutes) and thereby your MP3Sparks balance, which is one and the same.

2. Get an AllPay pincode from forum member
anyo using PayPal:
pincode.it.cx ($10, $20)
The whole process from your request till you actually get the pincode from
anyo usually takes minutes.
This pincode you can use to refill your allTunes balance (within a couple of more minutes) and thereby your MP3Sparks balance, which is one and the same.
Link taken down by Mod.
NO LONGER USE THIS VENDOR.HE HAS NOT BEEN GIVEN OUT PINCODES AFTER RECEIVING MONEY W/ NO RESPONSE.HE IS NO LONGER IN GOOD STANDING WITH THIS SITE

3. Get an AllPay pincode from forum member
meloman77 using PayPal:
EZ-Allpay - Allpay cards sales ($10, $15, $20)
The whole process from your request till you actually get the pincode from
meloman77 usually takes minutes.
This pincode you can use to refill your allTunes balance (within a couple of more minutes) and thereby your MP3Sparks balance, which is one and the same.

Go to the respective three sites for further information