coinbase.go
func (c Client) GetBuyPrice(qty int) (*pricesHolder, error) {
	return c.getPrice("buy", qty)
}
func (c Client) GetBuyPrice(qty int) (*pricesHolder, error) {
	return c.getPrice("buy", qty)
}
func ( c Client ) GetBuyPrice ( qty int ) ( * pricesHolder , error ) { return c . getPrice ( " " , qty ) }
// GetBuyPrice gets the current BTC buy price
GetBuyPrice gets the current BTC buy price