I've been doing craft markets for a few years now so I thought I would give you some insight and tricks based on my (good and bad) experiences!
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Shop small first!! but if you can't find anything locally, then: Craft market essentials: https://www.amazon.co.uk/shop/influencer-7a02fe5f/list/3J7BW8RFWM404?ref_=cm_sw_r_cp_ud_aipsflist_0BJBZHYYXA1PHQ0YPAB3
Chapters:
0:00 intro
1:13 Tip No.1
2:11 Tip No.2
3:34 Tip No.3
5:30 Tip No.4
7:05 Tip No.5
8:31 Tip No.6
10:50 Tip No.7
13:31 Tip No.8
15:57 Tip No.9
18:02 Tip No.10
18:53 Tip No.11
19:51 Tip No.12