Pricing starts at 57.49EUR for an AGP Radeon HD 2400 Pro card with 256MB DDR2 memory but unfortunately the cards aren't available yet. Most webshops are only taking preorders but there are two shops that claim they are able to ship the 256MB GeCube AGP card in 24h.
Here's a look at the pricing and specifications of the cards:
GeCube Radeon HD 2400 Pro, 256MB DDR2, DVI, TV-out, AGP (GC-RX24PGA2-D3) - €64,66 GeCube Radeon HD 2400 Pro, 512MB DDR2, DVI, TV-out, AGP (GC-RX24PGA2-E3) - €75,48 PowerColor Radeon HD 2400 Pro, 256MB DDR2, 2x DVI, TV-out, AGP (R61BG-ND3) - €57,49