Of course. There are trade suppliers that the kitchen fitting companies can use where they can obtain carcasses and basic doors at lower prices than you can get them for in retailers and still make a margin.
The major cost is in the labour unless you go for quite upmarket products, so if the material cost is low enough, then it can come to similar figures.
Plumbing and especially electrics in a kitchen are detailed and time consuming so if you account for these as well, the delta becomes less between DIY and installed.
.andy
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