When I wanted to progress beyond tin kits, which almost always produced excellent results, but felt less "creative", I looked into the options. I tried adding a tin of malt extract instead of shop sugar, and this was also good. Then found there are umpteen varieties of hops, so I tried malt syrup and hops, also good. These options worked out just fine, but there was no economy factor, and the options were costing me extra. I liked the results, but I felt like my vanity was making life more expensive.
I checked it out, and I found that a 25kg container of malt syrup make the unit cost a whole lot cheaper. I was paying ~ £10 for a 1.5kg tin of malt, and using two tins. 25kg of malt syrup cost £72. £6.66/kg by the tin. £2.88/kg in bulk. So I took a deep breath, and ordered in 25kg, and I have never looked back.
Using this method I can make 25L of beer using 3 or 4 kg of malt syrup, ~ £10, and an endless variety of hops, sometimes mixed, sometimes single variety, sometimes extra hops, like 1 1/2 packs, under £5 per 100g pack.
Every few months I roughly measure out 3 kg of syrup, and for many more brews it feels like there is an endless supply left for next time. When feeling extra tight I could substitute some shop sugar for syrup, making it last longer. Homebrewing might be a money saving exercise, but the real fun is in the making, and you don't need to race all the way to the bottom to save every penny. I have been using all malt for ages.
When ordering bits and pieces online the postage costs stack up, making the bulk container yet better value.
I've stuck here. Sure the purists would head off to using malted grain, home grown hops, speciality yeasts, dechlorinated water, co2 flushing, cold crashing, moon phases and more, but I have been so happy with this formula, I have stuck with it.