Cheap build - ordering overseas?

so I'm putting together a cheap build and i've already got a case, hdd, dvdrw and all the non vital components, i just need a mobo, ram, psu and cpu so I'm thinking Athlon tri core with some inexpensive fast ram and a mobo which has some room for upgrade and so far this is what i have

http://www.dabs.com/products/amd-athlon-ii-x3-455-3-3gh...
62
http://www.amazon.co.uk/Kingston-1600MHz-hyperX-Memory-...
16
http://www.amazon.co.uk/Asus-M5A78L-M-LX-V2-Motherboard...
40
http://www.amazon.co.uk/650-WATT-supply-Alpine-Silent/d...
19

total cost: 138

what i want is to see if i can bring the price down any more and also i want to know if anyone from the UK has ordered from overseas before as newegg has the cpu at $80 which is allot cheaper than the UK

what do you need to know before ordering PC parts or anything really from overseas?