When arriving to Czech Republic try to find accommodation with Wi-Fi, normally it is not problem. Also, most cafes and restaurants will provide you with free Wi-Fi especially in touristic centers.
Internet for emergency purposes
For emergency purpose you can buy T-Mobile TWIST, which costs about 34 EUR and will give you 3 GB of fast internet, after using this amount, FUP will be applied and then you will be switched to something really slow.
There are also less expensive options for TWIST from T-Mobile.
If you need just to check email, roaming via your operator might be a cheaper option.
Looking for other advise – ask on fiverr.