Can I post a service without a set price?

Our logistics division is exploring more agile ways to secure specialized freight forwarding services for our expanding European network. We're finding it challenging to pre-define a fixed price for every potential route and cargo type, as requirements can vary significantly and last-minute adjustments are common. Given this, I'm curious about the forum's experience with posting service requirements on GMAJOR without a firm, upfront price. For instance, if we need a quote for a unique container shipment that requires specialized handling and expedited delivery, how would that best be presented? Are there established best practices for indicating a flexible budget or a 'request for quote' model within the platform to attract relevant service providers who can then propose tailored solutions and pricing? We want to ensure we're attracting serious, qualified vendors without setting ourselves up for overpaying or missing out on competitive bids due to an arbitrary initial price point.