Slightly snarky reply. The difference between this panel and my wallets is that they use very little material, so the material cost is pretty minimal (in fact, I often make them from offcuts from other projects). I haven't seen an equivalent product (a brief look on Etsy shows similar items are more expensive).
If I were to make a panel for you, assuming I'd need a metre of fabric, that's about £7 (eBay), then another couple of pounds for the reflective tape, if that's what you wanted. Say £10 for materials. Then you have the labour cost. That Swedish one works out at about £14 - I wouldn't be able to make you one for that (because I'm not buying the fabric/tape in bulk).