Hello Pasapa,
Antec VP450P costs 2.8k on MD computers but its available for pre-order. May be they don't have stock now. Link
Antec VP450P is also available in Theitdepot for nearly same price but again availability is unknown. Link
Alternative is Antec VP500PC, that is available for 3k on MD computers. Link
Antec VP500PC is also available in Primeabgb but you have to call them to know the price. Link
First you can look for local computer stores for Antec PSU because warranty claiming would be easy if bought locally. If you couldn't find one, then go for MD computers which is said to be trusted online computer store and they will help you for warranty claims. Alternatives are Theitdepot, Theitwares, Primeabgb, Overclockerszone (For Seasonic PSUs) and etc. I have bought computer parts from these stores and there service is always excellent.
Thanks...
Best Regards