Good spot! Tho you can still usually get them in bulk quite cheap, even at the bigger size I think!
Lidl ones are Ø11mm x L280mm. Yours Ø7mm x 100mm much smaller
You can get packs of 50 online for under £5. Just recently got a deal for 100 less than £2.20. Gold is out of stock but if you want silver here is a link for 50 for £3. 50 Glitter Hot Glue Sticks, SMALUCK® 7mm x 100mm Mini Hot Melt Glue Gun Sticks for 20W Hot Melt Glue Gun, Silver https://smile.amazon.co.uk/dp/B08RJ5JYJF/ref=cm_sw_r_cp_api_glt_fabc_MFH16CNYWDVZMBC4PJDK?psc=1 This is
Glitters nice but it takes ages for it to all clear out of the gluegun….