The reversed Page of Wands shows that you are thinking rationally about purchasing the dress, considering the costs and benefits. You are aware that you need to make an educated decision based on your financial circumstances and would like to find a cheaper alternative.
The reversed Six of Wands indicates that you are feeling a mixture of mixed emotions. On the one hand you want the dress and are willing to spend a little to get it, but on the other hand you fear that you won't be able to handle the financial consequences of the purchase.
The last card, the Seven of Swords, reveals that you are motivated to take action and seek a solution. You're trying to find a cheap alternative and would like to avoid making an impulse buy, but you're also considering taking up the original offer in case you can't find a better alternative.
According to the tarot, the chance that you will find a better offer is real, but it depends on how much effort you put into looking for it. The most likely answer is therefore "Yes": if you do enough research, you may find a cheaper alternative.