Recommend Me A Solution

My friend wants to use homebrew and play backups on his DS. He would prefer to have GBA support as well. He has an old v1 Nintendo DS flashed to FlashMe v8a.

He doesn't want to spend much money, and if need be, will sacrifice some features for price.
What solutions would yall recommend?
PS by solutions I mean what carts or methods to run Homebrew/backups on his DS.
Oh, and he also has a Gameboy Advance.

I myself am happy with my R4DS+EZ-Flash 3in1. He just hopes he doesn't have to wait for R4 to come back in stock much less pay the price for a combo.

Please keep the forum rules in mind. Discussion of DS and GBA backups are not allowed.

The simplest and possibly cheapest route is this 1gb card or this 2gb card. These wont have gba support but the memory is built in and its as simple as drag and drop. I own 2 of the 1gb's and a 2gb and all 3 were bought from those links.

The shipping is slow but its cheap and simple.