since this is the most famous LEGO set this month, i'll try to watch this market. hope this simple research could help and add your knowledge.
for set database:
7679 republic fighter tank click here.now the report.
where to buy?LEGO shop ultimate LEGO online store.
australia AUD 99.99 - austria EUR 64.99 - belgium EUR 69.99 - canada NA - denmark DKK 569.00 - finland EUR 75.95 - france metropolitan EUR 69.99 - germany EUR 69.99 - ireland EUR 69.99 - italy EUR 69.99 - luxembourg EUR 69.99 - netherlands EUR 69.99 - new zealand NZD 99.99 - portugal EUR 59.95 - spain EUR 59.95 - sweden SEK 699.00 - switzerland CHF 109.00 - united kingdom GBP 49.99 - united states NA.
bricklink unofficial LEGO marketplace.
price history minimum USD95 - maximum USD119.
ebay buy or sell practically anything on ebay.
ebay.de germany base ebay.
price may vary, depend on item is fixed priced or on auction.
amazon.com
conclusion
for this time,if you really want this set,it is available everywhere but united states and canada.
so you're only chance to get is from bricklink and ebay.
if you don't mind high price tag (but sometimes you can find good bargain), bricklink is the best place, please be sure you're ask for shipping and handling cost first before placing order.
if you can handle the fun of auction and maybe you're lucky enough to get cheaper price than the market price, go to ebay.
hope this research can be useful.
happy building.