In cooperation with my father, who trains in Pilsen, we have become authorized dealers of the YONEX and HEAD brand for the Pilsen region. It follows that we offer a complete range of these brands.
Below is a link to the e-shop of the distributor in the Czech Republic, where the final prices are listed. Send me a link to the goods that interested you and I will immediately inform you of the personal price for you.
I personally play with the Yonex VCore 98L racket, which I highly recommend to all more advanced players, but also for beginners, but with a bigger head!
At the same time, I offer the opportunity to arrange a training session with me and test the Yonex VCore 98L, so that you know what you are getting into! 
https://www.yonex.cz/
https://www.head.com/cs_CZ/
Products bellow are in stock and available:
Tennis balls Yonex Tour (tube/4 balls) – 150 CZK
We also offer immediately available HEAD tennis balls (tube/4 balls):
– Head Team – 130 CZK when buying 1 tube, 120 CZK when buying a box (18 tube)
– Head Championship – 150 CZK when buying 1 tube, 140 CZK when buying a box (18 tube)
– Head Pro – 160 CZK when buying 1 tube, 150 CZK when buying a box (18 tube)
– Head Tour XT – 190 CZK when buying 1 tube, 180 CZK when buying a box (18 tube)
For more information contact me via email or phone, see more in the contact link.