[lover08]

Take O2 operator

They have these options:

3GB - 550 CZK
10GB - 800 CZK
(I think it is impossible to use more than 10GB in 10 days)

Step 1: but SIM card O2
Step 2: Topup ammount
Step 3: activate bundle

Step one: you can buy in Czech or you can buy in advance
on Ebay
Step two: Topup online in advance or Topup in Czech O2 or small kiosk
Step three: activate bundle online if you bought in advance or send sms
IVML to 999000 (for 3GB) or IVMXL to 999000 for 10GB

Cheers