We do not offer free ISBNs that can be used for distribution with retailers and bookshops, the cost of publishing with Bookvault Publishing and obtaining one of our ISBNs is £24.95
If you are only wanting to sell on our store The Great British Book Shop and your own website, then you can have our system generate a dummy ISBN - this is a standard title setup so would either be £19.95, £4.95 or Free depending on the plan you are on / use of promo code etc.