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You can use a lower from wherever. Aero Precision makes more than 50% of other manufacturers lowers today... they are a good option and can usually be had less than $100.
I would suggest buying a prebuilt upper and building out your lower as you see fit. It's easy and requires very little tools. The upper requires specialized tools so you won't save any money there - at least on yoru first build. You won't beat a Daniel Defense cold hammer forged barrel... so if you don't want to get a standard DD upper... you can get one of the uppers from AIM Surplus that include DD barrels. Definitely a good option.
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Handguns: 2x Glock 19.4 | Glock 26.4 | HK USP 9 | HK P2000 | HK VP9 SK | HK P30 | CZ Shadow 2 | CZ P-10 C | CZ P-07 | CZP-01 | S&W 360PD
Rifles: DDM4 | SGL 21 | SAM7K | Draco | PSA PDW SBR | ASA Side-Charger SBR | CZ Scorpion K SBR | Aero M4E1 9" 300blk SBR | Angstadt Jack9 SBR | Savage Mark II FV-SR
Shotguns: Mossberg 590A1 20" SP | Mossberg Shockwave
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