美国采购需求：定制短袖 T 恤、定制棉质 T 恤、运动服供应商、纯色 T 恤供应商、男士圆领 T 恤、男士超大 T 恤

Hello! I'm interested in sourcing t-shirts in the following colors: black, white, red, and yellow. Could you provide me with details regarding the available sizes and fabric options for these colors? I'd also like to know about the minimum order quantities and pricing for bulk purchases. Additionally, if you have any catalog or samples to share, that would be great! It would help me make a decision faster. I'm looking for quality products and reliable lead times, so any info on your production capabilities would also be helpful. Looking forward to your response!