The DNA store is a part of the ingame main menu where you can buy DNA via robux and see your current DNA. After every 12 hours, you can get a 'daily bonus' of 100 DNA. The store is available on all maps, including the trading map, making it useful as a expensive "top-up" on DNA.
DNA is purchasable using ROBUX.
|ROBUX cost||DNA||Bonus DNA||Total DNA||DNA per ROBUCK|
|4 ROBUX||10 DNA||10 DNA||2.5 DPR|
|20 ROBUX||50 DNA||10 DNA||60 DNA||3 DPR|
|40 ROBUX||100 DNA||25 DNA||125 DNA||3.125 DPR|
|200 ROBUX||500 DNA||150 DNA||650 DNA||3.25 DPR|
|400 ROBUX||1000 DNA||350 DNA||1350 DNA||3.375 DPR|
|800 ROBUX||2000 DNA||800 DNA||2800 DNA||3.5 DPR|
|2000 ROBUX||5000 DNA||2500 DNA||7500 DNA||3.75 DPR|
|4000 ROBUX||10000 DNA||7250 DNA||17250 DNA||4.3125 DPR|
Considering that 1 ROBUCK is essentially $0.01 USD, 17250 for 4000 ROBUX means the maximum efficiency will get you 431 DNA for every dollar you spend. Likewise, the minimum effiency at 10 for 4 ROBUX gets you only 250 DNA for every dollar you spend.