Found this of interest, a bit more expensive than wet phone books, (Although much more accurate)
. https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwi2tebItIGAAxUg_bsIHQ1kAswQFnoECDAQAQ&url=https://www.defensible.co.uk/products/p/ballistic-gel-1kg&usg=AOvVaw3yhVlJRl7c5EBxqC8BzFep&opi=89978449
. https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwi2tebItIGAAxUg_bsIHQ1kAswQFnoECDAQAQ&url=https://www.defensible.co.uk/products/p/ballistic-gel-1kg&usg=AOvVaw3yhVlJRl7c5EBxqC8BzFep&opi=89978449
