Yeah, they are pretty pricey, but the customization is really nice. I can't say they are good as I have not received mine yet, but you can view some impressions on this thread:
https://www.head-fi.org/threads/vesper-audio-custom-earpads-impressions-thread.864077/
I pasted the below email pricing that they inform me.
Email Vesper Audio gave on their options:
Onkyo A800 pads = $68 USD
The pads for Onkyo will also include plastic bases with double-sided adhesive rings. (the stock pads are also equipped with plastic bases, but they are snap-twist mounted, but the result is the same)
Detailed pricing(in usd) is as follows:
Basic set of handcrafted custom earpads - all leather, all fleecy materials(vegan), or hybrid, not angled, black, regular foam - is $59/$68pair.
You can order standard or any custom thickness, angle, opening. You can choose any quoted material for any part of the pads.
Options we offer:
1. Real whole grain leather:
Black, emerald ink, grey, blue, dark blue, navy blue, red, coral, dark brown, beige, ivory - no extra
Any other color for whole grain real leather available as an extra $20 option
Real whole grain leather with not through perforation (black color only) - $3 extra
Through perforation on whole grain real leather (any quoted color) - $19 extra
2. Fleecy materials:
Alcantara - black, dark-blue, sandy brown - $8 extra
Perforated microsuede(dark brown) - no extra,
Black, brown, grey, blue, beige, red, burgundy, dark-green, pale lilac microsuede, - no extra
Real black suede (chamois) - $7 extra, brown - $20 extra
Velour - black, brown, grey, pastel green - no extra
Through perforation on fleecy materials (any quoted color) - $16 extra
3. Filling and shape options:
Memory foam - $4 extra
Natural latex(20 mm. thick only) - $18 extra
Additional gel cooling - $9 extra (compatible with real leather on face contacting surface only, fleecy materials may be elsewhere)
Angled pads - $6 extra
Glasses grove - $15 extra
Horn like shape - $12 extra
4. Shipping
Air tracked mail - $14
EMS - $61
Please note, all prices are quoted for
paypal payment. You may pay 7% less with USDT.
Production time is currently ~26 b. days. Please let us know if you are ready to proceed with payment (along with options and payment type of your choice) or if you have more questions.