Looking at DSCL they don't do that size.
One Vision Imaging do, but they aren't cheap. Great quality though. Inc vat in brackets
Product Name 1 to 9 10 to 24 25+
10x8" Metallic Print (4.50) 5.40 (3.15) 3.78 (2.52) 3.02
12x8" Metallic Print (6.00) 7.20 (4.20) 5.04 (3.36) 4.03
12x10" Metallic Print (8.00) 9.60 (5.60) 6.72 (4.48) 5.38
14x10" Metallic Print (11.00) 13.20 (7.70) 9.24 (6.16) 7.39
14x11" Metallic Print (11.00) 13.20 (7.70) 9.24 (6.16) 7.39
15x10" Metallic Print (10.00) 12.00 (7.00) 8.40 (5.60) 6.72
15x12" Metallic Print (12.00) 14.40 (8.40) 10.08 (6.72) 8.06
16x12" Metallic Print (12.00) 14.40 (8.40) 10.08 (6.72) 8.06
18x12" Metallic Print (14.00) 16.80 (9.80) 11.76 (7.84) 9.41
20x16" Metallic Print (20.00) 24.00 (14.00) 16.80 (11.20) 13.44
24x16" Metallic Print (22.00) 26.40 (15.40) 18.48 (12.32) 14.78
24x20" Metallic Print (27.50) 33.00 (19.25) 23.10 (15.40) 18.48
30x20" Metallic Print (35.00) 42.00 (24.50) 29.40 (19.60) 23.52
30x24" Metallic Print (40.00) 48.00 (28.00) 33.60 (21.00) 25.20
36x24" Metallic Print (47.00) 56.40 (32.90) 39.48 (26.32) 31.58
40x30" Metallic Print (55.00) 66.00 (38.50) 46.20 (30.80) 36.96
48x36" Metallic Print (75.00) 90.00 (52.50) 63.00 (42.00) 50.40
60x40" Metallic Print (105.00) 126.00 (73.50) 88.20 (58.80) 70.56
10x10" Metallic Print (7.00) 8.40 (4.90) 5.88 (0.00) 0.00
11x11" Metallic Print (9.50) 11.40 (6.65) 7.98 (5.32) 6.38
12x12" Metallic Print (12.00) 14.40 (8.40) 10.08 (6.72) 8.06
14x14" Metallic Print (14.00) 16.80 (10.50) 12.60 (8.40) 10.08
16x16" Metallic Print (18.00) 21.60 (12.60) 15.12 (10.08) 12.10
20x20" Metallic Print (25.00) 30.00 (17.50) 21.00 (14.00) 16.80
24x24" Metallic Print (30.00) 36.00 (21.00) 25.20 (16.80) 20.16
30x30" Metallic Print (43.00) 51.60 (30.10) 36.12 (24.08) 28.90
16x8" Metallic Print (12.00) 14.40 (8.40) 10.08 (6.72) 8.06
20x8" Metallic Print (15.00) 18.00 (10.50) 12.60 (8.40) 10.08
20x10" Metallic Print (17.50) 21.00 (12.25) 14.70 (9.80) 11.76
28x10" Metallic Print (27.50) 33.00 (19.25) 23.10 (15.40) 18.48
28x11" Metallic Print (28.00) 33.60 (19.60) 23.52 (15.68) 18.82
30x10" Metallic Print (29.00) 34.80 (20.30) 24.36 (16.24) 19.49
30x11" Metallic Print (30.00) 36.00 (21.00) 25.20 (16.80) 20.16