I know EXACTLY how you feel dude.
Anyway, you can get an EDGE almost at every gaming store nowadays (Avast, Gameline, TV Games, so many others in an SM near you). It's sorta like the "mainstream" flashcart available around the Philippines, and people are already even selling it in bundles with MicroSDs. I got mine on its own for P1500, cheaper than the P2000 ones I find everywhere. But I heard you can get it at even less at Greenhills (why of course) but it's pretty far from where I am.
I also found the DSTT lying around exclusively in TV Games (I think you can only find that store in SM's, I got mine from SM Megamall). Cost me P1500, but with flashcarts other than EDGE and R4 clones in the Philippines, it was well worth it.
Another one; I have the original R4. In other words, the one that's completely safe XD
Formerly the mainstream cart (replaced by EDGE as I said) I got it for P2000 when EDGE didn't even exist yet and that was in TriNoma. But, don't bother getting an R4 since they're all probably clones and could damage your MicroSD/DS if you're not careful...
Recently also I saw just one shop in TriNoma selling...I'm not familiar with this one...Acekard2i at a price way above P2000. That's for if you happen to have a DSi, but if you do have a DSi you should do some more research on whether it would work o_o
Finally, there are some old MK2's lying around at some shops like TV Games and Circuit City, but no, an old outdated Slot-2 flashcart like that will not do you any good, trust me on that. XD
Conclusion: I personally think you'd be best off buying an EDGE. I'm telling you, as the current popular flashcart of the Philippines you could find them almost everywhere in any mall.
Good luck finding the cheapest one you can get, you'll need it. =)