multispectral array target for calibration

Trawling through previous discussions I see it has been a while since someone posted on this topic so probably worth revisiting. Is there any company making good quality and cheap targets these days? (I'm using a sentera multi spec 5 band for the purpose of multi year vegetation monitoring). General enquiries shows that Group8tech make a good target but expensive and labsphere has been mentioned. Any other suggestions?

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