The highest selling ccTLD was Sommerhus.dk.Sommerhus.dk was sold through Sedo for $114,625 . Top 15 ccTLD sales in Aprile 2012 :

1. Sommerhus.dk   $114,625
2. Geschenkideen.de    $65,500
3. Hike.in   $32,000
4. Code.co.uk   $28,800
5. Doctor.tv   $25,000
6. Circus.es   $19,650
7. Fantasyrama.uk   $28,800
8. Weedin.gs   $16,192
9. DigitalPrinting.co.uk   $16,119
10. Ethylotest.me   $15,065
11. Klik.pl   $13,755
12. Chocolat.fr   $13,100
13. Fromatob.co.uk   $13,100
14. JKW.de  $12,969
15. CrowdFunding.co.uk   $10,000
15. (tie) EyeCare.tv   $10,000
15. (tie) Medico,tv  $10,000
15. (tie) Golfing.co.za   $10,000

Source from http://www.domainnamenews.com

Now the .asia domain only cost 6.9 USD for the first year
other domain name you may need.
.com  only  USD  9.77/year
.net   only  USD  9.77/year
.hk    only  USD  22.63/year

To register your own domain name, check out :
http://www.eranet.com
http://partner.eranet.com