Need Recommendation: Store for Motorcycle Equipment

Hi everybody!

I am looking for a recommendation for a store for motorcycle equipment because I don‘t know the city at all. Also I don’t know anything about motorcycles.

I am living in Germany. One of our colleagues will soon move to Houston. He likes riding his motorcycle here in Germany and will buy a new motorcycle once he is in the US. We don’t know yet which brand it’s gonna be. But we want to buy a gift voucher / coupon at a good store where he can buy motorcycle equipment or accessories like attachments or whatsoever.

So can you recommend any store where I could buy a voucher online (through PayPal or Apple Pay) to just print out here? We‘d of course also forward him the digital version (email or pdf) once we have actually given him his presents.

Thanks in advance!