it must be mostly impossible. check on el corte ingles, perhaps now that the world cup is taking place they have it, but i just saw the big teams national teams, and USAP merchandasing.
fc barcelona have a team on the first spanish division, perhaps they sell the jersey on the big camp nou store. unio esportiva santboiana, one of the oldest team in the country, from a close town, sant boi, play in the same league, dont know if they have a shop.
2 more city teams are Universitari (linked to universitat de barcelona) and Gotics (placed in Sants), but will be difficult find a jersey.
catalan rugby federation was one of the FIRA founding members.
Thank you for the very helpful reply
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