Cheapest PAL Region Store to Buy 3DS Online?

I'd say wait for the 2DS because no one uses the 3d feature and it's cheaper

You'll need to commit to a region at least physically since the 3DS has region lock. So, games from JP cannot play on a US device, and it's shady whether US games can play on a PAL device (I haven't tried this). Your cheapest bet is to buy a US device and stick to the US region since they get most of the games; PAL has rare to no benefits in game availability. The eShop lets you change regions, but purchases are locked to that specific region (which means a power reset per change to access your games) and there's no universal account functionality yet; you can only transfer purchases from one 3DS to another.

Post that, it depends on which model you want. The original 3DS is somewhat cheaper and far more portable, but the XL feels better and has a larger screen. I'd recc the XL, but if shoving things into your pocket on the go is moderately important, the original is probably better suited. It also depends on what game/handheld bundles are available this winter, since those are pretty good in value.

How much is expensive, just out of curiosity?

NTSC, PAL, SECAM, etc don't really come into play when referring to handhelds.
They're definition display standards, not region ones.

Since Nintendo are greedy scammers and digital games are at least at the price of the physical ones I'd recommend you to buy your games via physical, + you will not have to worry about all the restrictions and messings of digital version

BUMP

Just need a link to a cheap european region online store that ships internationally for the 3DS SYSTEM. Thanks!

(Bumped because Pokemon X Y are out tomorrow and I still didn't get one.)