Will entropay charge anything for that....

yup 4.95% of fund that you add to your credit.

Again Hobbyking will charge some amount right.

FYI I made a payment via Visa Axis Debit Card, directly, without paypal or anything on HK.
Was charged TOTAL+2.93% (No Paypal).

yes they will,
But it was still worth buying from ebay cause same items I would have purchased in india for about 2000/- and I got it for 900.

Yes if we can use our debit card then thats no problem in HK