A longer, more challenging but absolutely beautiful chant invoking the goddess Lakshmi, called the Mahalakshmi Astakam found in the Padma Purana. I chant the first three verses but have listed the rest below for your further exploration. I learned this melody from Stephanie Snyder.
namastē'stu mahāmāyē śrīpīṭhē surapūjitē |
śaṅkhachakra gadāhastē mahālakṣmi namō'stu tē
I bow to you O Mahamaya, the one who resides in Sripetha and is worshipped by Suras (devas)
The one who holds Shanka (conch), Chakra(disc) and Gadha (mace) in her hands, I bow to her the Goddess Mahalakshmi
namastē garuḍārūḍhē kōlāsura bhayaṅkari |
sarvapāpaharē dēvi mahālakṣmi namō'stu tē
I bow to you, whose vehicle is Garuda, who created great fear and annihilated the demon Kolasura
The Goddess who removes all the sins, O Mahalakshmi I bow to you
sarvajñē sarvavaradē sarva duṣṭa bhayaṅkari |
sarvaduḥkha harē dēvi mahālakṣmi namō'stu tē
(Salutations to Devi) The one who knows everything (sarvagna), bestower of all the boons, whose name frightens the wicked
The Devi who removes all the miseries and sorrows, O Mahalakshmi I bow to you
siddhi buddhi pradē dēvi bhukti mukti pradāyini |
mantra mūrtē sadā dēvi mahālakṣmi namō'stu tē
The giver of siddhi (success or accomplishment), buddhi (intelligence) and who grants the worldly pleasures (bukthi) as well as the Liberation (Mukti)
The one who is always an embodied form of mantra, Goddess Mahalakshmi I bow to you
ādyanta rahitē dēvi ādiśakti mahēśvari |
yōgajñē yōga sambhūtē mahālakṣmi namō'stu tē
O Devi who is infinite without beginning or the end, Who represents the primordial Energy, Maheshwari
One Who is associated with the yogic knowledge, who is born from yoga, I bow to you Goddess Mahalakshmi
sthūla sūkṣma mahāraudrē mahāśakti mahōdarē |
mahā pāpa harē dēvi mahālakṣmi namō'stu tē
The one who is present in gross, subtle as well as fearsome forms, the maha shakti, who saves the universe by keeping it in her great womb.
O Devi the remover of the great sins, I bow to you Goddess Mahalakshmi
padmāsana sthitē dēvi parabrahma svarūpiṇi |
paramēśi jaganmātaḥ mahālakṣmi namō'stu tē
The Devi who is seated on a lotus in the Padmasana position, Whose form represents the supreme being
O Paramesi (who is supreme), Jaganmata (the mother of the Universe), Mahalakshmi, I bow to you
śvētāmbaradharē dēvi nānālaṅkāra bhūṣitē |
jagasthitē jaganmātaḥ mahālakṣmi namō'stu tē
The one who wears white clothing, Who is adorned with jewels and various ornaments
Who preserves and protects the worlds, the mother of the universe, Goddess Mahalakshmi, I bow to you
Om shreem mahalakshmiyei namaha x3 (or more)
I call to the great goddess Lakshmi
Jai Ma
Victory to the great mother
*Translation by www.hinduismoutlook.com
Suggested practices you can use to follow-on or explore similar themes
Simple Guru Mantra Tutorial
Guru Mantra
Purnamada mantra