Making edibles advice

Can't smoke anymore as it caused COPD. So I've switched to edibles. I'm from UK so I buy it from someone who makes sweets 300mg 5 in a bag. I worked out I have about 100mg per dose for my desired high. It costs me £20 per bag and I buy 4 per week which costs £80. This person uses shatter to make the edibles.

I'm sick of eating sweets every day to get high. How can I make my own. I tried ages ago with butter and although it was good I felt like it cost more than buying the sweets. I used a Q of weed. Any advice? I'm just looking for best/cheapest way to make edibles but not sweets or if it has to be sweets I'd rather 100mg in just one small sweet instead of having to eat 3.