Nintendo 3ds flashcart

I have been searching through the topic and so far some are helpful some are not.
I am going to buy nintendo 3ds soon so i am wondering which flashcart would be better for me.
list of requirement for the flashcart i will buy (possible cheaper)
-be able to pay by using paypal in UK
-able to run GBA game (I don't mind if it can run Gba game or not)
-possible to run 3DS game in future but not nowthis the link i was looking at but not sure if they are trustable
http://www.game4deal.com/index.php?main_page=product_info&cPath=69_70&products_id=184
well it the only link i can fine =/
thank for your time reading this

thank for reply. just wondering how long would ds last with this R4i gold 3ds or supercard dstwo if i set it low light mode and no 3d

well, thank for you help again.. i just order it =)

one thing ethan forgot to mention is that these cards only run on ds mode. therefore most likely wont play 3ds roms in the future. and besides, the 3ds is not hacked yet so we dont know if we will need a flashcart for that or maybe its a hack like the psp were you can place the roms on the sd card

well, problem with my ordering =/ they don't take in debt card but only credit card...... do any of you know any website that take in debtcard

o darn.. only have debt card =/
Post Merge: [time]1351712078[/time]
found a site that do paypal ::)
http://www.zhuzhuchina.com/store/promo_dsi_r4i_gold_slot-1__www_r4ids_cn__3ds_1_4_4_compatible_wood_rev_c_max_1_piece.html
but when i check out the order and not sure which one i should pick
Upgrade registered air mail from China , tracking code avaible recommended
or
UK registered airmail , shipping about 2-3 weeks , item will be shipped to uk and then from uk royal mail again

Thank for all your reply...but i has no luck buying r4i gold 3ds =/
could you list any website that are selling those and are trustable. also be able to use debt card or paypal
or is there any shop in UK that i can buy this
-------------------------------------------------------------just order it with paypal... =)
and can be close