For rush shipping to Boulder, CO, specifically for orders less than $20, the cost can vary depending on the courier and service type:

• Denver Boulder Couriers offers rush delivery starting at $5 by bike and $14.50 by car within the Denver/Boulder metro areas. These are guaranteed rush deliveries with options for 15 minutes up to 4 hours delivery times

• UPS Store locations in Boulder provide estimated shipping rates, but actual rush shipping costs depend on package specifics and additional services. They recommend visiting the store or using their online calculator for precise quotes. Note that rates for UPS Ground and air services may vary and do not include extra surcharges or guarantees

• Rush production fees for printing orders under $21 can be around $4 to $9, but this is separate from shipping costs and applies to production speed, not delivery

• Other courier services in Boulder offer same-day and rush delivery with times under 60 minutes, but pricing details require direct contact

In summary, for a typical small package under $20 value, rush shipping by local courier bike service starts at about $5, while car delivery starts at about $14.50. UPS Store rush shipping costs vary and need to be estimated per package. Additional fees and surcharges may apply depending on the exact service and package details