Any of the cheap generic fibreglass poles should do, cut and shut the end poles to transfer the tips if the glass ones are wrong type. Getting the right diameter shouldn’t be too hard, or maybe a wanted ad for old tent poles.
Maybe wander over to bearbonesbikepacking website, they do single DAC poles priced on length.
The Terra Nova direct site is all RRP, not many places carry spare pole sets, so you might struggle to find them cheaper, same goes with the top end pegs.
Cougar, if your thinking of the Zep lite, also check out the Terra Nova Laser on Uttings, a small jump in price again, but a serious jump in tenting. I paid about £250 for a Laser 11 years ago, it’s still going strong.